• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.76-79
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• 2001

In Japan in of today, there is no aspect in which the quantity of waste glass bottle discharged from ordinary homes decreases. Moreover, the kind of shape and color of the waste glass bottles are increasing little by little. In the recycling of the glass bottle, it becomes a problem that many kind of the color is abounding. It is possible to use the transparent glass bottle as raw material of the glassware. Since the reproduction of the color is difficult, the colored glass bottle is not possible to use as a raw material. Therefore, the processing of these glass bottles entirely depends on the reclamation. In Japan, the security of the new reclaimed land is very difficult for the reason of the environmental damage. Moreover, the life expectancy in many reclaimed lands is anticipated with within two years. Therefore, the development of the processing method of glass bottle other than reclamation becomes a rapid problem. At present it is examined that it is used of an aggregate of the colored pavement, as one of the application methods of colored glass bottle. The particle size of produced glass aggregate is also 5mm or less, because the thickness is 5mm or less on almost glass bottles. And almost glass particles have the sharp tip. The application as the aggregate is limited for this sharpness of the particle. This study was carried out for the purpose of the establishment of sharpness measuring method of the glass aggregate particle. It is possible that the injury degree to human in the handling is known, if showing the sharpness of the aggregate particle at the objective numerical value is possible. And the application of the glass aggregate is spread. In this research, the balloon fracture method was used for the sharpness measurement of the glass particle. This method is based on the completely new idea, and it is possible to express completely the possibility of injury to the human. It is reported with the detailed result in full paper, because this study is continuous in order to get the JIS which is industrial standard of Japan.

• 한국해양학회지
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• 제30권1호
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• pp.27-38
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• 1995

GPS 측위 방법과 무선 주파수를 응용하여는 연안에서의 해류구조 및 변화에 대한 지속적이고 동시성의 자료를 실시간으로 관측할 수 있는 해류 관측 연구 분야에 적합 한 새로운 장비를 개발하고자 하였다. 본 연구에서는 GPS 위성으로부터 수신한 위치 자료를 재 전송하는 송신 장치(이동 물체: Buoy)와 육상 또는 선박에서 수신하는 수신 기(Receiving system) 및 이를 분석하고 추적하며 처리하는 소프트웨어의 3가지 중요 개발이 이루어 졌다. 특히 시스템 중에서 송신용 및 수신용의 RF Modem은 기존의 유선 방식의 Modem과 달리 무선에서 의 응용으로 해양 자료전송 기술 발전을 가져왔고, 부 표(이동물체)의 위치 추적 소프트웨어는 국내에서 실제로 처음으로 성공한 경우라 할 수 있다. 본 시스템을 기존의 상품화된 표층해류 관측부표(예: 아고스 부표)에 비하여 운용비 및 제작 단가가 저렴하며 실시간 자료 획득이 가능하며 해류관측 뿐만 아니라 각종 해양과 육상에서도 응용이 가능하다.

• 한국소음진동공학회논문집
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• 제26권1호
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• pp.69-74
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• 2016

A technique for improving estimation accuracy is introduced in order to locate the impact position of artillery shell during the weapon scoring test. Study on localization of impacts using acoustic measurement has been conducted and the usability of sensor array is verified with experiments. When the blast occurs above the ground in the firing range, the acoustic sensor above the ground can measure the directly propagated sound with the ground-reflected one. In this study, a method for reducing estimation error by using the reflection signal measurements based on the time difference of arrival method. Considering the reflection sound works as same as placing a virtual sensor symmetrically through the ground. This idea enables a virtual three-dimensional array configuration with a two-dimensional plane array above the ground as such. The time difference between the direct and the reflected propagations can be estimated using cepstrum analysis. Performance test has been made in the simulation experiment in the football size area.

• 디자인학연구
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• 제14권1호
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• pp.27-34
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• 2001

인상이나 감성적 기호가 구매에 영향을 주는 제품군의 디과인에 있어서는 사용자 시점으로부터의 감성적 평가를 디자인 프로세스의 보다 상류단계에서부터 실시하여 그 결과를 아이디어 스케치 개량을 위한 유효한 정보로서 피드백시킬 필요가 있다. 한편 감성적 평가에 있어서, SD법(의미미분척도법)으로 대표되는 종래의 이미지 평가에서는 계측대상을 [집단적인]경향으로 취급하여 독립적으로 판단을 하도록 요구되어져 왔다. 그러나 이러한 SD법적 평가만으로는 사물인지과정에 있어서 인간의 유연한 유사성 판단능력을 평가에 반영시키기에는 불충분하다. 따라서 본 연구에서는, 직감적 판단에 의한 자극의 분류와, 계층분석법 및 퍼지적분법에 기초를 둔 계층적 이미지 평가 방법을 제안하였다. 평가 프로세스는 평가 자극 및 평가 항목의 직감적 분류, 동일 카테고리 내에서의 대표예의 선정, 각 자극의 이미지평정, 피지적분법에 의한 우선도의 산출 등의 순서에 따라 진행되며, 이러한 평가 프로세스를 상호대화적인 환경하에서 수행하기 위한 평가지원용 소프트웨어를 개발하였다.

• 지역연구
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• 제32권4호
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• pp.3-18
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• 2016

본 연구는 지역 R&D 성과평가를 위한 방법론으로서 비교그룹 간 분석을 적용하여 실증분석하고 있다. 분석방법론으로 기업 간 분석(between-group analysis)을 제시하고 있으며 핵심 아이디어는 두 가지 측면에서 설명될 수 있다. 첫째, R&D 사업의 효과분석을 위해서는 기간별 성과를 비교하며 분석하는 것이 당해 연도 성과만을 분석하며 비교하는 것보다 타당하다는 점이다. 둘째, 정부의 R&D 투자가 이루어지지 않은 비교집단을 선정하여 제3의 변수들의 효과를 통제한다는 점이다. 분석 결과 기업 간 분석이 의미 있게 나타났으며, 이는 수혜 기업의 성과만을 가지고 전후 비교하는 것보다 수혜를 받지 않는 대조군과의 전후 비교 평가를 통해 더 합리적이고 객관적인 성과평가를 달성할 수 있음을 시사한다.

• 한국과학교육학회지
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• 제15권3호
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• pp.332-348
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• 1995

The use of attitude as a psychological concepts dates back to 1918(Thomas and Znaniecki). Assessment of attitudes has been conducted by a number of researchers since then in a wide range of contexts: religion, government, industry, community interrelations, and education; and sociology and psychology. In science, the number of research summaries and meta-analyses points to the significance of the concept of attitude toward science. However, in spite of the wide spread use of attitude assessment in science, many of the existing instruments have severe limitations. Those limitations serve as the rationale for the construction of a new instrument to assess attitudes toward science The term "attitude" and "science" are somewhat ambiguous, taking on different meanings for different people in different contexts. Very often an assessment includes several dimensions of attitude and, therefore, provides no clear idea of what was really measured. As a result there is no consistency with respect to the construct among attitude instruments. To clarify this issue, Gauld(1982), Munby(1983a, 1983b), Blosser(1984) and Haladyna and Shaughnessy(1982) offer some guiding descriptions. Attitude as it relates to science is divided into two areas-scientific attitude and attitude toward science. Scientific attitude refers to a particular approach a person assumes for solving problems, for assessing ideas and information, and for making decisions. It includes such scientific methods and predispositions as objectivity, suspended judgement, critical evaluation, and skepticism. Munby(1983a, 1983b) characterized scientific attitude as thinking as scientists do, that is, acting on evidence in a disciplined way. Attitude toward science. on the other hand, may address scientific attitudes, scientists, scientific careers, methods of teaching science, scientific interests, parts of curriculum, or the subject of science in the classroom (Blosser,1984). It may refer to belief about processes, theoretical products, technological products, or the science-technology relationship (Munby, 1983).

• International Journal of Fluid Machinery and Systems
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• 제8권4호
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• pp.264-273
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• 2015

This presentation describes an experimental approach for the detection of cavitation in hydraulic machines by use of ultrasonic signal analysis. Instead of using the high frequency pulses (typically 1MHz) only for transit time measurement different other signal characteristics are extracted from the individual signals and its correlation function with reference signals in order to gain knowledge of the water conditions. As the pulse repetition rate is high (typically 100Hz), statistical parameters can be extracted of the signals. The idea is to find patterns in the parameters by a classifier that can distinguish between the different water states. This classification scheme has been applied to different cavitation sections: a sphere in a water flow in circular tube at the HSLU in Lucerne, a NACA profile in a cavitation tunnel and two Francis model test turbines all at LMH in Lausanne. From the signal raw data several statistical parameters in the time and frequency domain as well as from the correlation function with reference signals have been determined. As classifiers two methods were used: neural feed forward networks and decision trees. For both classification methods realizations with lowest complexity as possible are of special interest. It is shown that two to three signal characteristics, two from the signal itself and one from the correlation function are in many cases sufficient for the detection capability. The final goal is to combine these results with operating point, vibration, acoustic emission and dynamic pressure information such that a distinction between dangerous and not dangerous cavitation is possible.

• 동서간호학연구지
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• 제10권1호
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• pp.117-125
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• 2004

Purpose: This study was attempted to investigate the demand, the recognition, and the attitude of general people on Natural Family Planning Method(NFP), and to provide basic data for a development of a program to establish a healthy sexual life. Method: This is a descriptive correlative study, collecting data by questionnaires. The subjects were 130 people of three urban areas from March 1 to April 15, 2004. The measurement tool used was about demand, recognition, and attitude to the natural birth control method. The data analysis was done by number, percent and T-test, Pearson's correlation coefficient, using SPSS program. Results: The recognition, attitude, and demand to natural birth control method was 3.01, 2.84 and 2.73 respectively. The higher recognition of correlation for natural family planning, the higher attitude(r=.864, p=.000) and demand(r= .525, p=.000) of correlation for natural family planning. It was confirmed that the study subjects almost produced self esteem and confidence recognizing at the idea of life and self value, and positively thought of need, recognition, and attitude of natural family planning method which could keep their own health management. Conclusion: As the result above, we suggest that an educational program should be developed, diffused and supported, and culturally formed by nation and social group to insist the benefit of conjugal relations in natural family planning as well as to support the knowledge deficit.

• International journal of advanced smart convergence
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• 제7권3호
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• pp.23-36
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• 2018

In wireless communication, efficient spectrum usage is an issue that has been an attractive research area for many technologies. Recently new technologies innovations allow compact radios to transmit with power efficient communication over very long distances. For example, Low-Power Wide Area Networks (LPWANs) are an attractive emerging platform to connect the Internet-of-Things (IoT). Especially, LoRa is one of LPWAN technologies and considered as an infrastructure solution for IoT. End-devices use LoRa protocol across a single wireless hop to communicate to gateway(s) connected to the internet which acts as a bridge and relays message between these LoRa end-devices to a central network server. The use of the (ISM) spectrum sharing for such long-range networking motivates us to implement spectrum sensing testbed for cognitive radio network based on LoRa and GNU radio. In cognitive radio (CR), secondary users (SUs) are able to sense and use this information to opportunistically access the licensed spectrum band in absence of the primary users (PUs). In general, PUs have not been very receptive of the idea of opportunistic spectrum sharing. That is, CR will harmfully interfere with operations of PUs. Subsequently, there is a need for experimenting with different techniques in a real system. In this paper, we implemented spectrum sensing for cognitive radio networks based on LoRa and GNU Radio, and further analyzed corresponding performances of the implemented systems. The implementation is done using Microchip LoRa evolution kits, USRPs, and GNU radio.

• 건축역사연구
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• 제16권6호
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• pp.7-26
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• 2007

This article is about restoring the wooden pagoda which located in Silsangsa Temple after historical research. The process of this study, first of all, the theoretical study was considered about similar examples of wooden pagoda and gilt-bronze pagoda in Gorye period and wooden pagoda in contemporary period. After that, the study was established by the present condition of Silsangsa wooden pagoda site, the characteristic of Silsangsa wooden pagoda, the form of arrangement, the scale and height. Finally, considering those studies, the wooden pagoda designed in detail. This restoring design tried to follow the inference in that time. Moreover, the design tried to involve the elements of characteristic of region and Silsangsa wooden pagoda. Therefore, the research establish period of Silsangsa wooden pagoda in Gorye period. Locally, it considered both elements of Silla and Baeckje. The arrange form of restoring wooden pagoda was freestyle arrangement that had two main building of a temple and one middle pagoda. The idea of structure was to establish of double Core system. This system inferred from the system of building structure in ancient wooden pagoda and middle and modern age of multistory wooden construction. According to measurement of foundation stone, the scale of restoring wooden pagoda followed the skill of Tang-scale. The connection structure of each floor followed laminated structure which was the general form of log frame in that time. After study of foundation's condition, the present writer deseeded to have restoring the wooden pagoda 9 stories tall. The final aim was to depend on the structural intuition of the present writer, the writer tried to restore beautiful wooden pagoda according to in those days which is solution for contradiction of unclear point. So, it could be make out a plane of restoring wooden pagoda.